Khalid Ibn Waleed (Allah be pleased with him) narated, I used to feel uneasy at night. So I came to the Prophet (peace and blessings be upon him) and I said, “I feel disturbed at night and I end up striking my sword on anything I see.”

The Prophet (peace and blessings be upon him) said, “Shall I not teach you the phrases taught to me by Ruhul-Ameen (Jibreel)?”